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Hi Abdul,
Every site as such is supposed to maintain, by law, a set of fire extinguishers to meet emergency situations. Also, they are supposed to be kept filled and maintained for immediate use when situation arises and to keep the fire under control or to put it off till the time the fire fighting forces arrive. There are limitation on how big a fire you can fight with an extinguisher, but remember, the quicker you are to hit the fire with a medium, the better and safer you are.
When you say "site", this will firstly depend on what kind of site you are referring to. For example you have sites manufacturing things using various material or a site could be just an office with some people working there.
I will answer this question by taking that the site will be an office with some people working there. If that is the case then there would generally be fire extinguishers that will suite Solid, Liquid and Electrical fire. Apart from these, there are also supposed to be fire blankets kept at fire points. Now that we have better fire fighting mediums available such as Halon, these work on multiple types of fire. However, what type of extinguishers are to be maintained at various sites would generally be based on what activity is carried out at that site, the material being used/handled etc. I have extracted some more info from the net and hope this will give you a better understanding.
Class A fires are ordinary materials like burning paper, lumber, cardboard, plastics etc. – Use water/Dry chemical.
Class B fires involve flammable or combustible liquids such as gasoline, kerosene, and
common organic solvents used in the laboratory. – Use foam / dry chemical/ CO2
Class C fires involve energized electrical equipment, such as appliances, switches, panel boxes,
power tools, hot plates and stirrers. Water can be a dangerous extinguishing medium for class C
fires because of the risk of electrical shock unless a specialized water mist extinguisher is used. - Use – Dry chemical / Halon / CO2
Class D fires involve combustible metals, such as magnesium, titanium, potassium and
Sodium. These materials burn at high temperatures and will react violently with water, air,
and/or other chemicals. Handle with care!! - Use – Dry chemical / Sand. Different other specific extinguishing media for different material on fire.
